Alston is not expected to require hospitalization, and he expects to return to the team. However, he and his family have requested privacy while he undergoes treatment.

“The Revolution fully support Kevin as he begins treatment,” said Revolution general manager Michael Burns. “Right now, the most important thing for Kevin, and his family, is to concentrate on returning to full health.

Get Sports Headlines in your inbox:

The Globe's most recent sports headlines delivered to your inbox every morning.